<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>动态组件与v-once指令</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">

        <component :is="type"></component>
        <!-- <child-one v-if="type === 'child-one'"></child-one>
        <child-two v-if="type === 'child-two'"></child-two> -->
        <button @click="handleClick">change</button>
    </div>
    <script>
        Vue.component('child-one', {
            template: '<div v-once>child-one</div>'
        })

        Vue.component('child-two', {
            template: '<div v-once>child-two</div>'
        })

        var vm = new Vue({
            el: '#app',
            data: {
                type: 'child-one'
            },
            methods: {
                handleClick: function() {
                    this.type = this.type === 'child-one' ? 'child-two' : 'child-one'
                }
            }
        })
    </script>
</body>
</html>